Lens-grinding machine.



A. L. EDMONDSON.

LENS GRINDING MACHINE.

APPLICATION FILED JUNE 6. I914.

n w w w, m B m 0 m m V M ME 6 t m m a U P m f a r F. 1 m 3 1 .t w L in A a UNITED STATES PATENT OFFICE.

ARTHUR L. EDMONDSON, 0F SEATTLE. WASHINGTON, ASSIGNOR TO RONALD M.

SHERMAN. OF PORTLAND, OREGON.

LENS-GRINDING MACHINE.

Specification of Letters Patent.

Patented Apr. 13., 1915.'

A plication filed June 6, 1914. Serial No. 843,573.

To all whom it may concern:

Be it known that I, ARTHUR L. EDMOND- SON, a citizen of the United States, and a resident of Seattle, King county, State of Washington, have invented a certain new and useful Improvement in Lens-Grinding Machines, of which the following is a specification..

My invention relates to lens grinding machines and has for its object the providing of an efficient, inexpensive device especially adapted for store use and grinding indi vidual lenses. I attain my ob ect by providing in a lens grinding mechanism, the combination of a spindle,'provided with lateral arms, a lap mounted on the spindle, a gimbal also provided with lateral arms, yielding connections between the extremities of the arms of the spindle and the gimbal permitting the latter to be moved in horizontal and vertical planes, a lever supported at one end by a universal joint,apen dent pin carried by such lever, and means for variably connect ing the latter with the gimbal, whereby ,pressure may be applied to the latter centrally 'and eccentrically, according to the Work to be done. This feature facilitates the truing of untrue lenses. The advantage of said construction is: It is safe, there are no parts which, in breaking, could maim the hand of the operator; the device may be readily kept in good repair,rand elliciently does all work required. I Y

A further object of my invention is to provide a construction in which all positive joints within reach of the abrading medium will be eliminated.

In the accompanyin drawings: Figure 1 is a vertical section 0 a lens grinding machine embodying my invention; Fig. 2 is a plan view of the gimbal; Fi 3 is a diametrical section of the center disk of said gimbal; Fig. 4 is a side elevation of the lens holding disk or block; and Fig. 5 is a sectional detail taken approximately on the line 55 of Fig. 1.

My machine comprises a fixed bowl-shaped casing, a, in which is centrally located a vertical, rotatable shaft 6. The means, with clutch connection, for rotating this shaft are not shown herein, but may be of any of the types ordinarily used in this class of machinery. Mounted onthe upper end of. the shaft, 2), is a removable head 6 on which is set-screwed a removable tool or lap c. The set-screw is indicated by c.

A diametrical drill hole is made in the shaft head I) at a point below the lap c. and a bar, d, of circular cross-section is inserted through said hole. Pins d prevent longitudinal displacement of the bar, (1, relative to the shaft head I), but do not restrict rotary displacement. The ends of the bar, d, are drilled and split diametrically, and transverse pins, 6, are firmly clamped in said split ends by the bolts (1 Flat steel spring members, f, in form like an inverted U have their lower ends firmly fixed in the split ends of the pins, e, and rivets 6' make this connection very rigid. On the upper portions of these spring members, 1 are fixed vertical posts 9. The lower ends g of these posts are enlarged and split, the spring memher being riveted in this split portion by the rivets 9 The spring members are reduced at their center portion f so as to have greater resiliency at this point. Compression coilsprmgs g encircle the posts 9.

A lug a on the outside of the casing, (1, forms a bearing for a vertical pivot post it, the upper end of said post being forked as at h to receive the trunnions i ofa sleeve 6.

An operating lever j, longitudinally adj ustable by means of a set-screv\ j, is mounted in the sleeve i. Said lever is provided at its end with a handle j The center portion of the lever i is made of reinforced cross-section, as shown at j and a transverse drill-hole in this portion forms a bearing for a pin m. Said pin is longitudinally adjustable by means of a set-screw m.

The gimbal, 0, comprises a ring 0 made with two radial arms 0 diametrically opposite each other. Said arms are provided .with slots 0 adapted to receive the vertical posts 9. Trunnioned in the ring 0 on the pivot pins 0* is the disk 0-". The latter made with two bearing holes 0. and a series of pin holes 0. A lens-holding disk or block of, made with projecting pins to fit in the holes 0 of the disk 0". :ulapted to hold the lens 1', the latter being cemented to the disk 0 in the usual manner, as indi cated at 1" in Fig. 1. T he pin 1) is adapted to bear down in one of the pinholes 0 so that pressure may be applied to the gimhal centrally or eccentrically and when pressure is exerted on the lever j the gimbal. 0, ill be forced downward against the resistance of the compression springs g, and the lens, 1', Will be brought into contact with the lap 0. By manipulating the lever j, the lens may be moved over the surface of the lap as required in order to properly grind the lens. The springs g normally tend to hold the gimbal o, elevated so that the lens 1- will be out of contact with the lap c. \Vhen, however, the lever j is operated so as to cause the pin m, to exert a thrust on the disk against the action of said springs 9 the lens 1' will be held down on the lap c.

' \Vhen the lever j is held down and moved about its universal joint, the gimbah o, and thereby the lens 1', will move correspondingly by virtue of the horizontal bar d, which is rotatable, the springs 9 which allow the gimbal to be displaced vertically, and the flat spring members f, which allow the gimbal to be displaced longitudinally relative to the bar d. The spring members, Y f, are not under constant stress. A constantly stressed spring of this character is dangerous when ruptured, serious damage frequently resulting. I have eliminated this dangerous element. By varying the point of pressure application I have provided a quick and convenient means for truing up nonsymmetrical or untrue lenses.

I claim:

1. In a lens grinder, the combination of a spindle, provided with lateral arms, a lap mounted on the spindle, a gimbal also provided with lateral arms, yielding connec- "tions between the extremit es .of the'arms of the spindle and the gimbal adapted to permit the latter to be moved inhorizontal and vertical planes, a lever supported at one end by a universal joint, a penderitbearingpin carried by such lever, ,and m'eans for connecting the latter with the gimbal.

2. In a lens grinder, the combination of a spindle, provided with lateral arms, a.-lap mounted on the spindle, a gimbal also provided with lateral arms, yielding connepmit the latter to tions between the extremities of the arms of the spindle and the gimbal adapted to pervertical planes, a lever supported at one end by a universal joint, a pendent bearin -pin carried by such lever, and means for variably connecting the latter. with the gimbal whereby to apply pressure to the latter centrally and eccentrically. 3. In a lens grinder, a spindle provided with mounted on the spindle, vided with lateral arms, yielding connections between the extremities of the arms of the spindle and the gimbal adapted to perthe combination of lateral arms, a lap a gimbal also pro;

' mit the latter to be moved in horizontal and by a universal joint, a pendent a lever supported at one end bearing pin for connecting vertical planes,

carried by such lever, means mit the be moved in horizontal andv ends the latter with the gimbal, and means normally holding the gimbal from the lap.

fl. In a lens grinder, the combination of a splndle provided with lateral arms, a lap mounted on the spindle, a gimbal also provided with lateral arms, yielding connections between the extremities of the arms of the spindle and the gimbal, adapted to permit the latter to be moved in horizontal and vertical planes, a lever supported at one end by a universal joint, a pendent bearing-pin carried by such lever, means for connecting the latter with the gimbal, and spring eleinents normally holding the gimbal from the 5. In a lens grinder, the combination of a spindle, provided with lateral arms, a lap mounted on the spindle, a gimbal also provided with lateral arms, yielding connections between the extremities of the arms of the spindle and the gimbal adapted to permit the latter to be moved in horizontal and vertical planes, a lever supported at one end by a universal joint, a pendent bearingpin carried by such lever, and means for variably connecting the latter with the gimbal whereby to apply pressure to the latter centrally and eccentrically, and ans normally holdlng the gimbal from the'- ap.

6. In a lens rinder, the combination of a spindle, provi ed with lateral arms, a lap mounted on the spindle, a gimbal also provided with lateral arms, yielding connections between the extremities of the arms of the spindle and the gimbal, adapted to perlatter to be moved in horizontal and a lever supported at one end joint, a pendent bearing pin carried by such lever, means for variably connecting the latter with the gimbal whereby to apply pressure to the latter centrally and eccentrica'lly and spring elements normally holding the gimbal from the lap.

7. In a lens grinder, the combination of a rotatable spindle, a lap supported by the spindle, a horizontal rockable shaft carried by said spindle; a gimbal provided with lateral arms, bifurcated resilient members the lower ends of which are connected with the of said horizontal shaft, spring-controlled vertically yielding means connecting the up er ends of said resilient members with said lateral arms of the gimbal, springs included in said connecting means, such springs adapted to normally holdthe gimbal from the la and a lever fulcrumed to permit universa movement, bearing on said gimbal.

8. In a lens grinder, the combination of a spindle, a lap supported by the spindle, a horizontal rockable shaft carried by said spindle; a gimbal rovided with ateral arms, bifurcated resilient mem rs the lower ends of which are connected with-the endsof said horizontal shaft, spring-controlled vertical planes, by a universal vertically yielding means connecting the upper ends of said resilient members with said lateral arms of the gimbal, springs included in said connecting means, such springs adapted to normally hold the gimbal from the lap; and a lever i'ulcrumed to permit universal movement, bearing on said gimbal, means for variably connecting the lever with said gimbal, whereby to apply pressure to the latter centrally and eccentrically.

9. In a lens grinder, the combination of a rotatable spindle, a lap supported by the spindle, a horizontal rockable shaft carried by said spindle; a gimbal provided with lateral arms, bifurcated resilient members the lower ends of which are connected with the ends of said rockable shaft, the resilient members being each provided at the top with a pin reciprocable in the related extremities of the lateral arms of the gimbal, and expansion springs on the pins of said resilient members, and a lever, fulcrumed to permit universal movement, bearing on said imbal.

10. In a lens grinder, the combination of a rotatable spindle, a lap supported by the spindle, a horizontal rockable shaft carried by said spindle; a gimbal provided with lateral arms, bifurcated resilient members the lower ends of which are connected with the ends of said rockable shaft, the resilient members being each provided at the top with a pin reciprocable in the related extremities of the lateral arms of the gimbal, and expansion springs on the pins of said resilient mhers, a lever, fulcrumed to permit uni sal movement, bearing on said gimbal, and means for variably connecting the lever with said gimbal, whereby to apply pressure to the latter centrally and eccentrically. I

11. In a lens grinding machine, the combination of a lap, a gimbal bearing on the latter made with a series of holes, one thereof located centrally and the others disposed eccentric-ally, a universally fulcrumed lever provided with means for being operatively connected with said gimbal with respect to the holes provided in the latter.

12. In a lens grinding machine, in combination with a lap, a gimbal seated on the latter, a universally fulcrunied lever and means for applying the pressure of the latter to the gimbal centrally and eccentrically.

ARTHUR L. EDMONDSON.

\Vit-nesses E. Frinnnnr, JOSEPH ALLEN.

Copies of thispatent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). G. 

